Bublé, 33, met The Devil Wears Prada star in 2005. He explains busy schedules were the reason behind the split in July from Blunt, 25.

"In my business it's tough to go out with another artist because you're never together," Bublé says. "You're lucky if you can see the person once every two to three months, and with Em, she was on her movies and I was doing my thing so it made it more difficult."

Still, the singer admits the breakup was hard. "I'll go home and I'll curl up in a ball and I'll cry. I'm not kidding. I'll just cry."

Bublé adds the split actually helped his songwriting.

"I'm really sentimental. That's why I think I love the music that I love," he says. "It's always tough to end a relationship, isn't it? It helps me actually to write. Whatever I'm going through, it's usually helpful."

Blunt inspired his 2007 Grammy-nominated song "Everything." After the breakup, Bublé penned a new song, "I Just Haven't Met You Yet." He said he's looking for another substantial woman for his next relationship.

"I don't want a pushover," he said. "I want a strong human being that doesn't put up with my BS. It turns me on actually."